how to pass unique value with message

[anthony_w]

I have a problem I can't seem to figure out how to solve.  I can't tell if
the answer is staring me in the face and I'm just not seeing it.

I have a server app with handlers in the pipeline like this.

H[A] -> H[B] -> H[C] -> H[D]

I need to calculate the elapsed time from A to D on a per-message basis. 
I'm ok with storing the starting time in a map somewhere when I'm in handler
A.  Is there a way to uniquely identify each message within Netty so that I
could retrieve the starting time when I get to handler D?  Having the client
include a unique value in the message is not an option.  Thanks.

anthony
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